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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e7ee4a01e8db1ec44cc7e0507adcc0592d3e48278f9b49982bfc124f6da418f' 
  AND token = '80LB0ZsQIGWZzh9ZNN1HdaS/z/lKBlnkizMA+bwSfno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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