Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793055151796673537fa5dfd590a1a09b8adfa59c2415312429eeac3e325b2a2' 
  AND token = '9fU1RVrcELp9oU4sTBTqMTHU4sat5/OG2AUh9rcWFy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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