Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7535e8f186568228104754cee1d3ba45dfee0b2a75b0d790d17dc4c7b4ea3faf' 
  AND token = 'RCBP/zIxZk+jSY4YK0FOyXMbxzoAbXfkOPpAEUXKdrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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