Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938601af5f5fb4a1b5221afaea9378ce0c76c6ee0acd94e57431613d3fb0f8de' 
  AND token = 'LK+tR92beGXQ6TfIHygndmzHfAqxqRnkRbtII/SGoY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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