SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e86e6137252676bf0a0319f1f887b7b1e712d3b3aa5cd2745f7d59c28c78972e' 
  AND token = 'ULBEhivnkFH7R3gTztp8ZjVO8KtRIGcIGGu+2s1hveI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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