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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c5e273570910973cf028702098c4b9fb9cd9a91dcc3df921d3c7db79e33dee8c' 
  AND token = '/2Em+TZI1Ct3qXBnup8OQzNXCE0LoZf71PITSP2T5GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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