Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b347a079ad1dfae1cc3588a37d189d5d5bf363e9113ce9390011c5532a63d0a7' 
  AND token = 'JmtW5OMuw1n3uf0zeR95t6Ae+T+edMtwWoRdzURdCyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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