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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '17a37e3b44d7b652657d03e5f5b5f5584b3b9773ea1334afca3b0c34abc2704a' 
  AND token = 'uQh98cW69rAxNvOUvkc4pkQ7qo5g4srAQ6gqLeu3VsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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