Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996fe8092bf03fa128c4cf3899a5851fb16c04475c807762a8a9d9292c8ac872' 
  AND token = 'pkJ2LWUsZmBvlN8RuCOAvE2ufvjGjD3pAN4CUtKslEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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