Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e24b35e64fcd36d168d4c068daa53fbd88d41934c1414b7d6325213c7ca038' 
  AND token = 'dT0YfAf/mbQo6/eEwW1CXAde6J7dcyg8CveKkNtj2aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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