Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68be07b7faf2c27369b1c839638bc7aefa3a50b7afaba1c01e0833a64551bd6' 
  AND token = 'Wyx0dFfGksa+mZ1U7fFPppLhVXHmtyt+J/8Pp3qlLR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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