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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ae3605ad180fbcece92d6deb4a29a8cfb29cac76f7d8f5182cf685c25ad8aaa' 
  AND token = 'bEY9VIImIWlLnT7A1Ow+ht7U7swy6WvaPqwGG0qnOvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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