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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8942cd1b72d6bc6538b66e97fbee3a51068ce49835fa9eb9e5042a7c94ab2eb8' 
  AND token = '4gIfoqddFHeHTQFzDC6sCAaoPXYhMLQNQ8YXwgLS3o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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