Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cadaf08a07b02335d1aeaa7b8952c68d0ae8bbd8f1c6a9f9451b0e14e70487a3' 
  AND token = 'mItRbOQqZ68YQ7weYJ47ExUtm2XPkht93boO7as8dLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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