Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6384bb3e3c582ea497a7f0f82baa71c39d1a388273b6c4fbf013af6b84a6a21' 
  AND token = '5DHtyG14ixYxjrbYSp9pWYTgmDfdYrKc6am2RWf1w+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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