Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8a373da6c42225029693bec5e0852d49263f899c75c6d6ce65c4cf36b254a0' 
  AND token = 'l0Rw7vwM950xATKMP/oI2bM3S37GFAZj3Xf46lbaNUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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