SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a94a04f254a1b8e93e35c5ab663dc58b23156fa465344b87591cc3b5aaff381' 
  AND token = 'Z0UzYSLwm8VisFFqNKlFRRb/20FQvdbq5f8iteVuUJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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