Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e23457cb3f0445ee305c6162145db288fae5a470e924ff21f078d2ddc001ec' 
  AND token = '76NYYsoj0FBA09oEGQ2NGKABiAUXXuwNK1nlLTkhNkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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