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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c1e96596b63a431106a439123f7b784fd87e5647ccc7e2ec8293ab57bf4daf20' 
  AND token = 'hWJrNCn2pFgVwwAWHLsvtcTvcMgOnevs2unC83s25f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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