Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6596dd188094efd08639d3d1de24591a7348bf5ef869ddd3b5aeea3dc1caf669' 
  AND token = 'zUB6dLsnoxPQ46JtcPtrmW+OU4/261izOmnnFNRY5wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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