Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da0f9342914bdcbe351eda094550c5e8cefe3becf745c1424479296bf86db8a' 
  AND token = 'HvYs0A1BcvtOS9v4Kbq+q2CeieXhm2CUmG/thdjlK0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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