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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fc745d6d85bdbbd7bd2aa637116a8c165bbb76b1cc5d0958aa05379a7abd27c1' 
  AND token = 'jgfUv8CBJ6ncZQcIdgMl9Y71silNI5X1Whaa3qHe0tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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