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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8f75ca1316109c8e6f4102732666a99ef42c15e1e05c8a09de5d2d2bb2729f5c' 
  AND token = '2Ibm3LJIj0J9dIJ75OeK2lu2zftIcbbq9GfzrGG52OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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