Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea240ee9ac505c2833b1d440960038cd245fe2f1744d04b4ad05ab2e57ee596' 
  AND token = '+K5x0E3SBJMa9yN8YxqOgM6bE9ykG2NNo7y8fuJ5Ca4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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