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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '84f338556e3059ae5b681d3c275bb29bb59c09d9f3e8e3cc90c22fa84a54fd05' 
  AND token = 'ApK+jgNvDa6FLmeh9S2nTHe9B/mvKC4jCgfdIEZkN08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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