Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38d2471f2c28ef2467974a404424f406ebd4ab9f94c6ccae827ab06b0400629' 
  AND token = 'U8Pvc2BGVR1CTTmgZGcN5jhXtZGLxN2RQ+qUHfd5eAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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