Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0759577e07f94476248f9e6a51501be3aa5ae61982f0cbe276a925015e5ba2c' 
  AND token = '4J0UCzj2V3CElis8BzcdwgTLAHV1bx+eugd5/e8uTjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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