Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803ec304718cc759b4516f6093e085d3203629ddb02faed86e453866db490a1c' 
  AND token = 'L1xijAoVNdD93j7FNWkd4Hx2l+Uyk3InduAmyKG3Xq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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