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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fa676810a63e43e1c671e601166d8057e56bbaa7a292c5d8104579202cbf4b14' 
  AND token = 'd2n3hxszJcVj4Utz5kYhqT58T0yJ/K0SvB5xc53SS84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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