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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '64b036a75e2f0856b7ae7b35b5fa008e3e39b8953b8065ba68ca6051178adf7b' 
  AND token = '7wi1NqK3jM+48gW+eIqQeRecnPUXLOzzhxI/Ty/z6x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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