Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68269a8d8ee78f5ce96f9381ab9f4a096450447186b6d8b256e3b0bee18e1cc' 
  AND token = 'qRv5vpCe37KvMVSgtitaALYYwpBFniuLrlh8zR2LEuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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