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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '72c359519b79571b5c12b56007f15ebd10572f54dc54dfd878dd580385e8717f' 
  AND token = 'QLsXWRKOa/mquprIr7N7HEC8M312FN4wGCZJuiEjvTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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