SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8e8083bfa331a5a0efc94b3f001b1a9297f5e721f39bd6153e144852e089b014' 
  AND token = 'ANiJpg50DDgO6K4iLCVkJUFJ4zJVHvVf4TN5wYJK0Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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