Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8518b79efbe0c1917b1664a81651195c37a2f6b0fab0713ce28b9ae1650f8e22' 
  AND token = 'OP7Q+nzueCUVb4lF5/QCGDkl8kvPaOowDNa8we41eAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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