Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566067c115507df1df837300434634e79eca5133745228bd12100e62632c6a51' 
  AND token = '9WH6azlzsBbBQyGLE48l51BdukmvPzinLZ5kGazYnXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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