Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456ee31d65cd006ecb53f199c3bab726c1c2e0763b3c90299c02b7de2ec770fb' 
  AND token = '1qc2B44J6b9IX6nD/wkwDxo+ljnKSs+DQKs6DPVKjiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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