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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae670a97e1b4e8e00a4122183408951d2831ba1d38bd24b0c2ca11f7e413b19d' 
  AND token = 'IRpX5Mt4u42t32AIs11beOptNbW4oCqfrOehzG7cUR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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