Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5fa5c262e9170a90a18981dbb88e4ec7e3d4e92141c15e4972377da89b49fa' 
  AND token = 'FZK8hfDoNdOM5aklmOo0A6MMpUkk1rxjYZwC5hO78Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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