Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cf51d0bab51e765a50d7e0523c5db610afcf2fd8f448ca394fe9bbfaee0d61' 
  AND token = 'La/B9xw8JRFSwAPvYflub10pNKMZxZe4Yv9Cf5ObZhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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