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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ac6c10ca83468918e46420fb5a14d7ce062d191c8aa943b9ab47ae894fc027e' 
  AND token = 'YPypgCeFKMmxKU9ef3MHxojt+EgHjx4DEJqAxlmN64I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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