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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c24e945e11fe650d9cb0eb2c3f78655f9182bf94550ba43e122a776124137cb8' 
  AND token = 'UdvoUwO5uyhk5NrYfD5t1MORW5tnpE+lAgy3KzbU5Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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