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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c0d927716ab0bf19529260c65e0c681ebb16c03ee5300a3505b9716c26e09db0' 
  AND token = '5AHkBTFLqyoiPwFiV86fvKAWA/l9nPVqgT/USnbPpW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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