Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d429cf3cbad9186b0ad5e04bc0bc0e20950ace26d9dc270e0941a69c7f1d2f6' 
  AND token = 'kLhdwCFXI08F6ZKHp+nfbngzYjcu1mSPzlqkLiTdqkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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