Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e671b0ddff394c3aa9cc7fe1d619997a5340a8e923704e2b382d4dd5326478ff' 
  AND token = 'bIiRPU9ScAthw2Ge5mP3T4DHpCw6j51r3bjXbGWvDQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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