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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c2472dcf00051cc69e02ecbe20426bffa2f045fbb420bee9e7605d2973bce3d5' 
  AND token = 'kAwMxQNGllwkF/7+JnXTa+R6RkIDNeVybVIFnk92gzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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