Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bca4eb91057ccf6da0b507cfb929926a5f56d1e8f1358b6bc94ba506fb07117' 
  AND token = 'gvXWt20JM1vh+fbHGMcywXVLw6Wk/hB2Tei44NGr+PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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