Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d7d8cacf8832a9e886e7a696404fa6d8027d5a9e04e61d979ece64e210d6c0' 
  AND token = '92NFgagO8Wz5Q1If4oRs/hZElq9BXiHGJohGZuASNjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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