Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01e254b8d7590b79100e4cd436418f17a76c17dc571f0f223dd2a3089f842a8' 
  AND token = 'ZJQPiVU/Rz2N5ns/6IzbuUP2F4UaDrQzFqI+Z13mEkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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