SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '30d71e84627d5e26839c4755d5592fe115da39852dcc4ef245b0b080e32b164c' 
  AND token = 'aiSoMzvaCECa3+XqHLtGuvUiwWQN+d3ppEY1Oh1YAZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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