Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb257af787ceb78995d39691b33136f65b851d311b2fb9a24ab086ed38385fe' 
  AND token = 'sMIaFp8eSXO1q+dY7Rltq6oLWZN7cKbNknJlLbrxvN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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