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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8a5b30715f2534556ae30a8ad6264eed6a457b67c367b85cb0e9264311435e9d' 
  AND token = 'ToMdkwqtp13cmUDjlc7WfesB+tNK/wHMHBU/fyVEVqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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