Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c19b32efcce455b9c2e081164f72844e928e9da51399dc105be56d309af6f6' 
  AND token = 'WMM4sq4s+OL5QzsXsLQsaM6Cju+lMsVBYOnVrrVe3xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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