Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7fc1c02b35b576ca43553ba03ab2f302d16fcaa6e0262d1f4404cf50b1fe0d' 
  AND token = '5I2XQqcPLdR8uc0H5Xumd6F4OjmRVjLbEJiUbfiLowI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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