Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a0f0bb2a135888a8ce4d087fc466d31dc76bf05bac7aa01477bbfd4ee6f7ef' 
  AND token = 'RVTNqAD/nSIeNBBMSCu3P2bliK9rxooOGwUrACWWe+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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