Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff942a55a4f59c63ca8d6e600c5bb0902082b0a24f928709cb2fd6b4cde18bf' 
  AND token = 'LIXn0ICgkiXq2UVwUVwD6Myn69CT7Rj07E5O4sgwIrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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