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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '77df958f6585e6f5e4f846933ff593c50e5a897698af83568b1c989266008d60' 
  AND token = 'aJfl5E7MRmd2iwXasIqC1YVe3N8O00e5DSG2P9/xM9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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