Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38c858af717f03b28d4e09aa03f9a67d9c4a06b93c53c30c0fed0050466fc06' 
  AND token = '0by/nr5+NH1Sc+pWfDY4+WaKeT4Ejv2awpbnzxAybIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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