Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1d29a5f493d92eca7681eee5d4ebb4c2a855f1667f03dac0e4f6dc088c5b02' 
  AND token = 'nn/AAQodp0I6UXi0YYV+1DqlxYj/Yj5dQcZKVD/1Cn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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