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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c702a9b727f462b8504dbbf5fec314e1b2592fc4c7eeef71eeb8683cde05934' 
  AND token = '9m9tTiCzlrVCCVTJPAjNx41o0K0eJU3J0wnX/coP9Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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