Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90a1fd2a1813ddeb3731889bcc081c78defd2126d83f91ef2e2b2333a3fd2b6' 
  AND token = 'egsQsYq4Uq+hwesp2YftnEFZIVfshdf+eEYUCwbqytY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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