Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5da742671d09e0b9ee7d7b71e1165cab1ab39ead35cd6473c160908a3c062ab' 
  AND token = 'mwdFrN1V/Z+j+hyKiPJ68XMW75pqYhD3STvof69DzcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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