Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b8aeb593fe1dc3a196d664ee2cc99796962796bd07ef6b963ba8acbf77782b' 
  AND token = 'rMNZLgWJz8t8RCwCpvrUfXJPc1Taq3D/CUy3xqMKRnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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