Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad27f5a1aa0d43124c46065ffcbe8df34fd3064da29b70cca403073a88134ebb' 
  AND token = 'Ltqp4jhIiNSGIlz16K840h8HUaHGmnWdbvS9yt7F7Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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