SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '77830e7ae4f5165e8efd91f834a1ab9b7c4f943f538199accbcc2bf5127d238f' 
  AND token = 'e1MgzRgZYppSwE2xAvHAthFRyFLYFM2sBIvL0tYgNHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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