Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b7ea97549f6fe5006f652cbd45799734e85c0f737f0cfef0e5a1c2701ec539' 
  AND token = '45mOJOKhjyknN4fDkBfxY6S7+lk8xx+2a2NjeCn4weQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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