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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0b33ccf62684ac74b5fec7e8ae664341baa19be3dce75fb2e5231069834b5995' 
  AND token = 'vIXaTjd2CVLEV/SUcGODQcYIlmVzkE49ql7SWiyDkFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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