Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c8f0a46d3f3452c15e6b13ce63d8c5bbccf28d849372a950ebf1bb2c55ffb2' 
  AND token = 'qd2cIQ8oMICmS2Z+eJKMzQDRIR/uGQ4UchzD9++dsbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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