Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9c675756b369313747a7fb0a5e630b063e3559ad2a846d6e8d20f796e85c53' 
  AND token = 'zP0evhWHyiUKISmDWFIsVSeMYxWJaD+wneKz8CEm/FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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