Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc0b1ec4f43a7dc6f627de5e549ee1c7b2e5186e81c4651728e1f91f6a1e850' 
  AND token = 'nFEYB0B3sFXR/11jmLJ87ccc4tc1p1S2LlmqMphmtkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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