Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921c476cf91e07ac8191eae559393c42eb165488b76ba01826f3490320e21bd5' 
  AND token = 'xKPNvWrBlsf+bFvLVyzTb0uzaaAD7QzsBc/nTjwooI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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