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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d3d7aed141a02a318091b297d31413fe6c853fce3e4b12cecf3185231562edf' 
  AND token = '3fD8WiVZyssG5dD17xZ7oQiFKo6hrlyK52lgTa7VPy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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