Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3c77ae8f7ab055ef813300c397459adc650f9b0080472857cf5bff3470c3f5' 
  AND token = '9a8vbyG2jSjIELX9sMhp2l5ypMICoOPLSwipMSoFgp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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