Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435e4205ddb6d9ca020dfdcb7b6356958b2767b6662f6e13a3668acc58cb08a1' 
  AND token = 'PzSF+lbUMmJ1TbyNQx3qeP4cEs8VTRp30tGDrUNSMG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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