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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a895a15d02e6b39a06a86c4596715ac436b7804a4c2737ea6d297eeb2f6715b7' 
  AND token = '05TP+V3L5gvZeqws1yWTReDD3tFHSn8Ok7Vhx6sm3bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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