Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86864920f4cbbea382030d8a90c759af7fcb2e0e9f1221a519c928691d8c99c' 
  AND token = '0tn4N0f88+nH1ehP4xtrUR7cQcEGAAgWrrjspeeWgZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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