Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b519996c5cabea853a7cb04a0b4eddf19bde99e163853128bfdfda780bb82bb' 
  AND token = 'vWn95fXaK10FpG7c2MOqPG5ycAkaxLqQWotCbVm/8Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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