Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35de3c019ec67a3c8b19a4a1c26d73fc7bf9212f0c5525750755ed3a45e2131' 
  AND token = 'iK/EeCIrRVOvUG+2r9WpR7ClS8BKfFmBQdwujVL+0nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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