Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3f8a5794c55e1b7f9bd5d4a4c6b506ae139a52829daeee6e59f7b42a0dca3a' 
  AND token = 'KPEDBPUP7IPG0/Nzkjwtd/rmx55M27vTpro+NGk7Tpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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