Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e897ead845417aab90293784cd26569b0e80f906c26ae52ce9f7499d70c30641' 
  AND token = 'U6aRJc4rn5gWaEzAxv8vmZqqXuB8X5vrpH0/Hf98emI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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