Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd665dfa5afab0d605d42fe17c233ce2dd47a066e6ca114c96de5ed84ca75dce4' 
  AND token = 'HbcJiL5ym+dmZ9nDfMniYNUcLHXDcxyaUYD9eOrmHVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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