Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29727b5ed5eb318d117ed0c2f44d6286e3e3086cf17dfd09803b52829387dc40' 
  AND token = '7krYP2LY3hMexr0JIDHvcrMjJLl5/urkm1xVRWu275g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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