Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9baeb2cf96001a896d9d056c1b4e6bf61b3dcb5f986f8c20549816ae3ebd8a8' 
  AND token = 'sWCDyCNc2Sq+6mughBisLp5tMLPqnz+2m4Se/EH4Fwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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