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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '986c253e9f4e347983a84ea5021a339cead6d47bf71dbcf8937bab66591cadc1' 
  AND token = 'Ee2BpDW50NJEzVtbIRdo4hnG/xDZfSxFcxqzaLy4fME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00142

JSON explain

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