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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'adad0216caa7106e8e18b4f86e12ab70e367a70995fa569729733c108b4c149c' 
  AND token = '54EnUp45DmgpPIEwCoBsNNPXwcrGO+cJdHASPJw8oeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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