Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2963f361a2e990f21d3b0ef3e059921515f614e4bb84260d4bf769d35312a4' 
  AND token = 'XYl/OBtTLsFIWpB6ffN/komAtpSAjYy447MyNjAzIwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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