Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863ac8113ed532647e5b2849d0c5615c98fad2452370990d3b0181a62c332f52' 
  AND token = '0hw8RDMYE/wvxJyEe+9d8cF1hTACfAQPBJfWvdYVazQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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