SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c7d7a473199ab674cf15296440245df0f3735263fdd9ee07476f8adf9a925b9e' 
  AND token = 'iRYONkzxTPg5R0k1tdxIqn2nTKKwddFoLOZ40B12vmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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