Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921058a62c7281ddd92ff6de7419eebc04a54e6d98f2f578d3fb2cc1b1a38759' 
  AND token = 'pMaICfN+ZA49T+rv6ScyshqstsMaaPrLPPcMrjDbuLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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