Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764e25a6936b0b3e655c3d3ec0ae01d613d0a984ab7bbac69f80c7339b123a79' 
  AND token = 'RX0e98NAYWy6n36d5p2qLBitbJIKL/l3kU7vh3z6Ye4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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