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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8137add3721971e392059fafc26f4c187f1de39264763aa380145499c2c1854b' 
  AND token = '2laFYzdm2h/w9Dw6Ptu0cJmYxL5oMahQ8u50GPs6WPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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