Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260db8cdaa216b4965dfc30e11974b93dac2eaf94204dc0e4d3b880a70e2b8fd' 
  AND token = 'h2r2rlrmps/3mkvz2qI1bL5yc7T7xm3fmpEiqW4lqy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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