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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f971a5b51354f7d816e1faf9b63a3356e3e13cd1dca771c36e06ae1094e774c2' 
  AND token = '5Ys5oVqjU0qUSsXci+0ertdg0fxIgTdbFi9nTJSmLfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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