Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c26fcdf17e6e3387875dd07e7a9ff50f88f63aa05aaffa10bf4ce953313e3b1' 
  AND token = 'dtFDDbVzhtWD2CHZkFTJElgffY3Jd7FRwGehhn2b83M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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