Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8c3e3cc9a5fea5df6f65342e2944f3b6211fc05e21d1b20713dd4e7f3e88ec' 
  AND token = '2RIclq/jRUNQ8x8m2iCzgauEszLY9SBTeAXXEUMHU4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}