Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3f71e2286fb2c2c38cf4e74a852a461ac6b23d97ac3bb60e1b83d13de55d8a' 
  AND token = 'b8hPE5oyzpi67lZNg6PPOLF0qSVNdq9mUwsdSH9BGW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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