Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eece365854dec65ff2f0a87d7415f02417e97d2230277563379145074540683' 
  AND token = '0BOQ46iyQke47hENoSta3MiTVJswHjlv3GsQC8HM5js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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