Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ad61b253ba74bbbfdc13e2250ca15eb7f9f9a5cd8d9c4b37770097482e18ea' 
  AND token = 'xi9UP+SaLogr/5KqA7LM2RgGUuf9EBWt2FS8UeNNrHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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