Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b607fd3bb0b211786560d3523a974110cdce8a878de268dc248f9c738cc8e454' 
  AND token = 'UnARVQygP0g62P1sDu79LMLIgPSJ7+p+2zpIRmni2ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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