Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6df7917977ef336e5f6f0030f4ac608594d07e6686401b71eda49593a0233a' 
  AND token = 'r9iLex69GdqbvgDyLSgMQiNvJNzGEiq6qm6R1YIxDko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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