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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6b1c228b1ada16ba8881bb26e541fdf3da0b4bca216d263890369cde4a472c6b' 
  AND token = 'DzjAmlbbWl1BZ6ThGSZVt6aYevx+u1fLIxzAaUSjeNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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