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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd9b9b30aed198abaf9d95733e8ce884daffe9061aeee3de01df12c20c1868b3a' 
  AND token = 'V/BFOkq5t+T0zph1iPQZNgcE5UVm/kBUhd3diI5PO1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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