SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67881e34169c725fea3b7295ff3e44bb7a65cc4104dfcab6219a979d005600d9' 
  AND token = 'FCSPrHyQcBPmNBLwz+vY9vwlxc8q1+2FMoRKKq2LFPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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