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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bca92e9edebeefdf18b3b4a682b0ded52962bea08e98a15e31059673825c193a' 
  AND token = 'S4I4ZjJVfxbOCWyWpGZmoQxUsTd3M2wfidZn+oJ3ruY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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