Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29957458c2f12de9eec3fc7e4a484b5adf2aa9b85ba9ffa7fb30fd940379fed8' 
  AND token = 'E+/kRvE/YgVIKpodAfBpMtmFdkNv2LIAIuZDv+BeERY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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