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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '71757b25cc8efa07ddefb1926c4e6a9c5c33042c2967a1ec5f3ea1ff0f8c81cc' 
  AND token = 'xoZW6TAVDwxIMklLy1NP05RcraelI+SWG0a0oNoPepw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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