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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3f62d9cdc6e4b96ba8265c3d8f335e3999683e612faf3c1ce9b4984caf6c8176' 
  AND token = 'VWUGgBbNQFOGN8yWjAY36tjD/S1Rkym9uYmlJ0N4S3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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