SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9e36b8f15eb06710bb08d5f35f8cec0e92600f9bf42e876596424987e07efdb6' 
  AND token = 'NeaJh59Egc+qzwUuWK1lDxSTpnDv4/a8Cy1myQdB8dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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