Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9583fe0a5e2b7a5c6d541244c4b63385f65f9fc7abdc304dbcd5923b866f555c' 
  AND token = 'yE5IAZUgVbHpSydF2uqEFw0rscnO80y/MFbjog6+gYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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