Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56875ece72bd621be092688d47372b14f9299f286cbfbf575f98b4ad1189ce47' 
  AND token = 'gq7vuvneWFPbhf91TnR78izh52PeIjmZ7ENvCpVWUaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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