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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8a74ddd790e31d86e0aeb6bc4d100f2d527f1a77b15b4326fd7579ec9e1eb08c' 
  AND token = 'vxhRv7X/jM7lT9lYw47TGg2HJk4FMjcy00W5kBx59Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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