Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90c7ae64eb1c10dd4eacd30dc6133c3053cc0bf02a4f666b18d039d8eebec75' 
  AND token = 'ykGJgsAqx1ds9T/YGczfDaP0G1SaYmILGs9RvVQ7WMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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