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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3a2649447759c65cd212654e87b5b671f96f3fe73efba565f8c88e24ba311996' 
  AND token = 'dDXYBWfoYW36SLL72AGai3MtwjygtEkP5tUEol/z79I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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