Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d473e0ab1b8dc987c7a2d65c38801b113ac7fee6f70e0ab0ebc8992338b7b5' 
  AND token = 'Bx7aJbZblief373WU8rph//gc4PRboSlN97CKT5YAQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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