Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503b1358c3e7400c15e218764876633907113051a1054bb766a752e02c4e24cc' 
  AND token = 'GvLxf6cqeyGyT5auV/riYUrWdzGjQZ7aU9wPu/Pstgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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