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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd671dd3ebbd1092d6d1453952fafeb48d44e7968af20218860df1407925ec831' 
  AND token = '4wtnp0aHc+e/fimoyGtao/eg2kkjjty4eh0OVwfDpbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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