Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3753bc66d0c2e28c1d442f4faff563c3dc55e17d5d8aa1507f01dd5ec158ffd' 
  AND token = 'bLOzA4QOR9NQliaGnGApLwXPEwTrWQAoy32ucBNocMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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