Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1743410a5f6fa9f184aa6a6e18f4f38a8d3c3115bdad7556e278d237fc45750' 
  AND token = 'MnodOokPrtbt4TC1z9VDJ7RRvp7OCJR0DyDsyO55Dg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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