Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d0642ad21320ea7e31d5071cd780f7a7d1d4f8a9580262a7e2403618a1284b' 
  AND token = 'bZcbaUNyHMaARr0JYeoLykdZu53k2lvyVDP/1iWTt6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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