Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42d3be92c8d378de3295ee11fdeabac0ed76fb714d796713a616c2019721d92' 
  AND token = 'KlhUVljKqtxMnBue303IfLM3bGfB4NqxKPjF4flDTb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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