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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '673386c4dbc8e9dff5ec941d1503a06de2a7bab28c5c1a8200e32bf27bfa571f' 
  AND token = 'irqRcbN/vdCYkTNf9nwocDQENcA/O/DDh23sEXmLFQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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