Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99eb3a877a41878b26157635f4b95d6254a108839e277bd6f992bd4769fba7e9' 
  AND token = 'q7xYhCmxaq+U0VD1b3c6VFfhfD41MsuA97883wKMA+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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